To do a full screen animation in Silver light that exhibits the functionality of this win32 app at tinyurl / 5ddvye
Basically the animation in silver light would have a button to start the full screen and you would then be able to control the cursor as in the mentioned app: with Q,A,O, and P for Up, Down, Left and Right.
It would be just to show on a web page the same functionalism of this app regarding cursor movement. Pretty easy. Even if you never did anything in Silver light you might be able to do it in a few hours.